

public class Test {

    public static void main(String[] args) {
        System.out.print(Integer.toBinaryString(255));
        System.out.println();
        System.out.print(Integer.toBinaryString(255));
        System.out.print(Integer.toBinaryString(255));
        System.out.println();
        System.out.print(Integer.toBinaryString(32));

        // string.matches的坑
        String password = "021Abc9000";
        System.out.println(password.matches(".*[abc].*"));
    }

}
